HP 3320A Operating And Service Manual page 152

@
- R I 9 -
-C4- -C5-
-C6-
-CR3- -CR4-
~R3- -R4-
-RI6-
158 mV
50 mV
158 mV
50 mV
158 mV
50 mV
158 mV
50 mV
158 mV
LOW LEVEL OUT
RELAY CONTACTS AS VIEWED FROM TOP
(K2-K5IDENTICAL TO KI)
TOXAI5'AI5
hp
Po,' No. 03320-66515(STANDARDj
03320- 66556 (OPTION 001)
Rev D
+
26.99
+
17 .00
+
16.99
+ 7.00
+
6.99
3.00
3.01
13.00
13.01
-CR- -C'i:2-
_RI_ - R 2 -
6) -=-~~=@
NOTE 3: To prevent oscillations on A 14 Assembly
I
measure de
voltage levels with high input resistance, low capacitance voltmeter
(·hp· 412Al.
NOTE 2: (CONT'D.)
AMPLITUDE
transistor(s) OF F
Table 1. Output Attenuatar.
*For Standard 3320B (50
n
output)
H
= +
5 V, L
=
0 V, -
=
transistor(s) ON, X
LOW signals
(0
V) at inputs (pins 3, 4, 5, and 6) puts in attenuation by de-energizing respective reed
relay(s). This attenuator provides 0 dB of attenuation when amplitude is set for maximum output
(+ 26.99 for 50
n,
+
24.99 for 75
n).
Switching occurs in 10 dB steps down from maximum output. A
truth table for various amplitude settings is listed below:
AMPLITUDE* INPUT LINES (LOW true) ATTENUATION TRANSISTORS
SETTING 4000 2000 2000 1000 (thru A 15) Ql Q2 Q3 Q4
+
26.99 H H H H
o
dB
- - -
-
+
16.99 H H H L 10 dB - X - -
+
6.99 H L H H 20 dB X - -
-
·
3.01 H L H L 30 dB X X - -
13.01 H L L H 40 dB X
-
X
-
· 23.01 H L L L 50 dB X X X -
33.01
L L H H 60 dB X
-
- X
·
43.01 L
L H L
70 dB
X X - X
53.01 L L L H 80 dB X - X X
63.01 L
L
L L 90 dB X X X X
SCHEMATIC CONNECTOR
NUMBER NUMBER INSTRUMENT TYPE
2
XA21A "B" Model - Standard,
Options 001,002,006
5
XA22B "B" Model - Option 004
10 XA22B "B" Model - Option 007
AI4
hp
Port :"10.03320-66514
Rev. A
NOTE 1: The following table lists the schematic number and
connector number versus instrument type for controller board
interfacing:
NOTE 2: The Low Level Out varies with settings of amplitude
controls. At maximum output (+ 26.99 dBm for 50
n,
+ 24.99 dBm
for 75 n), the output is 158 mV. At all levels in 10 dB steps down
from maximum output, the Low Level Out is 158 mV. See output
level for standard (50 n) unit listed below.
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